Zeta

Instead of re-implementing ZZT, Zeta emulates a pared-down x86 system which can run ZZT and Super ZZT. Zeta offers several quality-of-life benefits over using DOSBox to emulate ZZT, such as more responsive handling of keyboard input, better CPU usage, and easy deployment options.

As of this writing (May 3rd 2019), Zeta does not support OpenGL ES. Performance of the native build may be slow if Raspbian does not have experimental desktop OpenGL support enabled (though the web build's performance in Chromium is enough to run basic games like Town of ZZT). It can be enabled for Raspbian in the raspi-config command line tool. You'll need to reboot the device after saving these changes. Be warned that this mode is still in the experimental stage and could potentially cause issues with other parts of the system, so make these changes at your own risk.